Which chords are referred to as primary triads?

Primary triads are the essential building blocks of harmony in Western music, typically derived from the major scale. The chords referred to as primary triads are the I (tonic), IV (subdominant), and V (dominant) chords. These triads are fundamental because they create a strong tonal foundation, allowing for the establishment of a key and providing resolution when combined effectively.

The I chord serves as the home base or tonic of the key, while the IV chord creates movement away from the tonic. The V chord has the strongest pull back to the tonic, giving a sense of tension and resolution that is central to Western harmonic practices. This triadic structure is widely used in various genres, making it a crucial aspect of music theory and composition.

The other choices do not represent primary triads as they include chords that are either secondary chords or do not belong to the foundational triadic structure commonly used in harmony.